Quote:
Originally Posted by Atomic Ed
It will still be quite when you close the NPP valve. Just like normal.
Put the NPP valve in a T or Y before the muffler and re-route the pipe out the back. You should cover the pipe hole coming out of the muffler also. Again, take a look at the NPP valve/muffler arrangement. Simple mod with control of the NPP valve as your cutout valve.
Should be a simple job for a muffler shop.
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Unfortunately this is wrong, think about it, you are relocating the NPP valve, before the mufflers in this scenario which would make the car like it was always open, and to the position you say to move it to would just make it louder. Closing it at the new location, you still have a free flowing exhaust system as if the system was open. and that answers your question as to why people are installing them.